OpenCL support for GPU and JtR

[Alex]

Hi,
I'm trying to get OpenCL support installed for using john to test 
passwords. I've installed every package related to OpenCL listed in the 
current repository for fedora20, and it still doesn't recognize it.

Is this a compiler issue? Is OpenCL fully support in fedora20?

The config.log from configure output reports this:

configure:9844: checking for gcc option to support OpenMP
configure:9859: gcc -o conftest -g -O2 -I/usr/local/include 
-I/usr/local/include  -L/usr/local/lib conftest.c  >&5
conftest.c:48:2: error: unknown type name 'choke'
   choke me
   ^

Any ideas greatly appreciated.
Thanks,
Alex